Graphics

<br />
Bitmap mybmp = new Bitmap(formwidth, formheight,PixelFormat.Format32bppArgb)<br />
//<br />
//code to capture image<br />
//<br />
<br />
System.IO.FileStream fs = System.IO.File.Open(imagePath, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.ReadWrite);<br />
<br />
mybmp.Save(fs, ImageFormat.Jpeg);<br />
fs.Close();<br />

//assign buffer graphics
    BufferedGraphicsContext CurrentContext = BufferedGraphicsManager.Current;
    BufferedGraphics bg = CurrentContext.Allocate(this.CreateGraphics(), this.ClientRectangle);
    bg.Graphics.TextRenderingHint = TextRenderingHint.AntiAlias;
    bg.Graphics.Clear(this.BackColor);

    //some method to drawing...
    this.draw(bg.Graphics)

    //render graphics
    bg.Render();
    bg.Dispose();

<br />
using System;<br />
using System.Drawing;<br />
using System.Drawing.Imaging;<br />
using System.Runtime.InteropServices;<br />
using System.Windows.Forms;<br />
<br />
namespace SlowGdi {<br />
	public partial class SlowGdiForm : Form {<br />
<br />
		private Random RandomSource = new Random();<br />
<br />
		private int[] RandomPixels = new int[512 * 512];<br />
        <br />
		private Bitmap RandomBitmap = new Bitmap(512, 512);<br />
<br />
		public SlowGdiForm()<br />
        {<br />
			InitializeComponent();<br />
            this.Disposed += (sender, e) => this.RandomBitmap.Dispose();<br />
			Application.Idle += (sender, e) => this.Invalidate();<br />
		}<br />
<br />
        private void SlowGdiForm_Paint(object sender, PaintEventArgs e)<br />
        {<br />
            for (int i = 0; i < RandomPixels.Length; i++) {<br />
				this.RandomPixels[i] = this.RandomSource.Next();<br />
			}<br />
			var Locked = this.RandomBitmap.LockBits(new Rectangle(0, 0, 512, 512), ImageLockMode.WriteOnly, PixelFormat.Format32bppRgb);<br />
            Marshal.Copy(this.RandomPixels, 0, Locked.Scan0, 512 * 512);<br />
			this.RandomBitmap.UnlockBits(Locked);<br />
            e.Graphics.DrawImage(this.RandomBitmap, 0, 0, 512, 512);//this.ClientSize.Width, this.ClientSize.Height);<br />
        }<br />
<br />
        private void SlowGdiForm_Load(object sender, EventArgs e)<br />
        {<br />
            SetStyle(ControlStyles.DoubleBuffer | ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true);<br />
        }<br />
	}<br />
}<br />
<br />